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Light and atmosphere affect the Quasi-equilibrium states of graphite oxide and graphene oxide powders.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chua, Chun Kiang Pumera, Martin
Description	Country affiliation: Singapore Author Affiliation: Chua CK ( Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Science, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.)
Abstract	Graphite oxide (GiO) and graphene oxide (GeO) possess wide applicability in technological devices. The exact chemical compositions, structures, and properties of these materials remain vague to the graphene community despite being heavily researched. As metastable materials, the properties of GiO and GeO are easily manipulated under various conditions of temperature, light, and atmosphere. Although these aspects are important considerations for long-term storage of the materials, they are not well understood. In this experimental work, investigations are performed to determine how light and atmosphere contribute to the characteristics of GiO and GeO powders. The study shows that, at room-temperature, the quasi-equilibrium states of both materials, in specific the O/C ratios, vary according to the storage conditions. Drastic disparities between GiO and GeO are observed. GiO kept away from light and GeO kept under inert atmosphere maintain relatively high O/C ratios. As the metastable states of the materials are governed by the diffusion of oxygen functionalities, the presence of epoxide groups diminishes while negligible changes occur to the sp(2) lattice size. This experimental work lays out fundamental aspects that govern the stability of frequently mass-produced GiO and GeO powders under different environments, with major implications on their optimal storage conditions.
File Format	HTM / HTML
ISSN	16136810
Issue Number	11
Journal	Small
Volume Number	11
e-ISSN	16136829
Language	English
Publisher	Wiley-VCH
Publisher Date	2015-03-18
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Medicine Biomaterials Engineering Biotechnology

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